Springboot获取bean实例之SpringContextUtil详解

package XXXXXXXX;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 *
 * 获取spring容器，以访问容器中定义的其他bean
 */
@Component
public class SpringContextUtil implements ApplicationContextAware {

    // Spring应用上下文环境
    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     *
     * @param applicationContext
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextUtil.applicationContext = applicationContext;
    }

    /**
     * @return ApplicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 通过name获取对象
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

}

package XXXXX;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class ShardingVariableConfig {
    @Value("${sharding.data.node}")
    private int dataNode;

    @Value("${sharding.table.node}")
    private int tableNode;
    //获取分库参数
    public int  getDataNode(){
        return this.dataNode;
    }
    //获取分表参数
    public int  getTableNode(){
        return this.tableNode;
    }
}

 ShardingVariableConfig valueService = (ShardingVariableConfig) SpringContextUtil.getBean("shardingVariableConfig");//bean的名称
        int dataNode = valueService.getDataNode();